Self-controlled pumping system.



A. O. DURDIN, JR. SELF CONTROLLED PUMPING SYSTEM.-

APPLIOATION FILED FEBZQ, 1912.

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' .TlliS invention relates' to self controlled' a pressure controlled pinnp for tarsus orries.

"A'sGsetU snsssmzgmisosiester-Qr g-Imam ASSIGNOR' re. CHICAGO rum? "com,

"*l sumjos CHICAGO}ILLI OIS h conrona'rion; 0F I I 1LINVO IS.;

Les (r752,

To all 1011 mini it m concern :1

die it known'that I" \oous'rusi .Donuts; "Jr a. citizen] of the'jllnitcd'state's; resid ng"- ("at .(.-hica'"o, in the 'county'of' Cook and" Statei "of I llinois, 1 have in\-'ented' new and -{useful *Improvements in .Self Controlled Pumping '\\-'hich'ftlie following 'a speci-'.

pumping systems of that class whichemploy umpmg water to a tank located ata higier'llevel than the pump, as for instance aroof tank, and the main objects of the invention are to obtain greater etlieiency, economy of operation and longer periods of workand rest for the pumping mechanism, and to provide such pumping system at a comparatively low cost.

In my improved pumping system I contemplate the use 0 different, pressures in the supply pipe for operating a pressure switch to close and open an e ectric circuit to an electric )ump. Pressure switches,

operated by variations of pressure in the system, have been employed for the purpose of starting and ate )pmg the pumping mechanism, but the dithculty encountered is that a very sensitive pressure switch is required on account of the slight variations in static pressure unless an abnornnillv high roof tank is used, making itpractical y impossible to successfully maintain the system in continuous operation. In the operation of my present system, the pressure may be caused to vary any number of pounds either way without atl'ectiug-the switch, so that the delicacy of operation required in the ordinary or well known systems is wholly eliminated. Other systems contemplate the use of cables or chains running 'from a lloat in the tank to a switch located near the pump, or the use. of electric cont'luetors running from a tloat controlled switch mechanism at the tank to an electrically operated pump, and this invention designs to avoid the use of such connections and makes use of wide variations of pressure. in the supply pipe of the system to etlcct. the. starting and stopping of the pump.

'lo such ends this invention consists of a pumping aystem .tor water distribution, having a pump controlled by a )ressure switch, having a comparatively Witlt! range of inactivity between its high and low act sELncoN'rRoLLED,rmviri iioisrs rsiiif I .ei'

min m we" -a :Pa-tentedItIa-r. 18', 1913.. Application tic'ktrepr'titiripiiqiz trauu. 680,648. 5

ing' points and operatedby variations of ;pre-ssu're' in the'sugapl pipe. j' 'lhe' invention urt ier consists-in the ser- -cralnovel features hereinafter set forth and im'ore" )articularly defined in the claims. Int-iedrawings furnished herewith, Figure 1 is"an elevation of a pumping system embed ing one form of my present inven- "tion,s towing the roof tank in vertical section, Fig. 2 is a detail vertical section of a valvecmployed in the system and Fig. 3 is a detail vertical-section of a pressure switch em loycd in the system. v

' n the drawings is shown a pumping mechanism 10, preferably comprising a uunp ll, of the centrifugal type, operated i) an electric motor 12. lumpin mechamsm of this kind is well known ancl requires no detailed description so far as this specification is concerned. The inlet ipe 13, communicates with the pump 11, at its intake 14, and the main supply pipe 15, of the s stem leads from the discharge end 16, of tie pump. Interposed in the supply pipe 15, and near the pum is a check valve 17, opening away from the pump, and beyond said check valve is a pipe 18, leading from 19, that controls tie motor l2. Said pressure switch may comprise any of the well known forms of pressure switch, operating under the influence of variations in pressure, and the pressure switch shown, has a diaphrngm 20, within the chamber 21, which communicates with the main supply pipe 15, through the pipe 18, wherebythediupbragm is continuously subjected to the pressure in the nmiu supply pipe l:'. A spring 22, held under compression between the diaphragm and a rin" 23, acts to more the. dia ibragnl against the pressure on the opposite side thereof. The force of the spring is regulated by screws 24, bearilu against the tapered side of the ring ill. \vl iercl'iy the switch may be set to operate in one direction at any desired degree of pressure. A reciprocable stem 9.5, operated by the diaphragm,engages with an oscillatory member ul an electric switch lti, the arrangement being such that downward movement of the stem arts to break the current through the switch and upward movement thereof acts to close the circuit. This particular form of pressure switch is of course not material to my inven the main supply pi e 16, to a pressure switch and sai the ordinary ball-cock-form, isprovided at v the upper end ;of.the sup operated I by; the rise. anc

sage-in thelvalvef l igLfll-shows 'a simple 'form ofvalve in which 30, is a vertically re ciprocable valve piece guided to move-in the casing of the valve-and arranged to seat upon a valve seat 31, surroundmgthe discharge port of the valve. 'The valvo piece ismoved V a lever 31', fulcrumed between its ends upon the casing-of the valvefandhav ing onearm engaging with thevalve piece and the other arm supporting a hollow ball or other float 32. This particular form of valve, however, is not material, but is sutIi-. cient for the purpose of illustration.

In the arrangement shown in the drawing, the supply pipe 15. extends to a point near the top of the tank and discharges at that point, and when a single pipe systcnris cmplo ved, such as is shown in the drawings, I provide an inlet to the-supply pi )e at a mint near the bottom of the tank, the inlet 'Hl this case being in the form-of a branch pipe 33, opening into the sup 71y pipe 16, and having a check valve 34, thereon opening toward the supply )ipe. It is obvious that water is free to (ischarge from the tank by way of the branch pipe and su )ply pipe. Branch service pipes 35, lead irom the main supply pipe at. the several "001's between the pump and tank and deliver water from the tank to the dealred places.

In the operation of the system, the pressure switch is set to close the circuit to the motor whenever the pressure in the supply pipe falls below a predetermined point and to break the circuit whenever the pressure in said supply wipe reaches a predetermined high point. 'the low iressure is deternnned by the height of the column of water in the supply pipe, and is the hydrostatic pressure o the column of water when the top of said column reaches a point sonicwhere near the bottom of the tank. For instance in a hundred foot rise, the static pressure of the column of water reaching a point near the bottom of the tank is about forty pounds per square inch, while the static pressure of a column of water reaching to the highest water level in a live to seven foot high tank is about forty-three 1 ipeale and is. ill of the {water in the tank to close andopen the water pasthrough thesupply pounds?Tlhissmall difference in pressures ietweent.he'=highand low points is not. sutlieient.',-ihowever,"to operate any commercial n'essurd-su-itch, with precision, as it has i een- "-'foun'd tliatlthey cannot be adjusted close' 'enough to operate'succcssfully at variations' rn'ue'lt below ten pounds. By'setting thepressure switch soas to close the circuit when the pressure falls to forty pounds and to. break the circuit when the pressure reaches fiftv, variation of ten pounds) ,it-act's satisfactorily inconncction with tlllS system co'ntaininga one hundred feet rise ofthe supply pipe. If the current be turned on,[thepump'starts and forces water up pipe and branches, (llS- charges water into t e tank from the valve at the top of the suppl pipe. As the pum continues to operate, tie water in the tan risesuntil it reaches the floatof the valve, whercu )on.it lifts the float and gradually closes no" dischar e port in the valve. The static-pressure 0t the column of water in the supply pi e reaching the high water level only forty-three pounds, and that is not sutlicient to affect the )ressure switch, but by reason of the partial closiu of the discharge passage in the valve, friction is created, causing the pressure in the supply pipe to rise above the static pressure, and when the pressure reaches fifty pounds or thereabout, the pressure switch is actuated thereby and operates to break the circuit, thus stopping the motor.

Upon the stoppage of the motor and pump, the excess pressure in the sup )ly pipe falls by reason of the leakage through the restricted discharge opening in the valve, but inasmuch a. the pressure simply falls to the static ircss ure of the column at its high water level, it does not fall sulliciently to atl'ect the pressure switch, consequently the motor and iunip remain at rest. \Vater is free to discharge from the tank by way of the inlet. branch 33, and through the supply pi )e and its branches, and as water in drawn oil, the level of the water in the. tank and supply pipe falls until the predetermined low level is reached, whereupon the static pressure of the column of water has fallen to its low limit, for instance forty pounds, at. which point. the iressure switch acts to close the circuit am start the motor. thus permittim the pump to relill the tank.

It is olivious that the. operation of this system de icnds upon a eompnrnli\'el wide range of dillereutial pressure in the supply pipe and that it is possible to use a (.tltllparatively low tank in which the static pressure of the water column docs Hut \ar v greatly, the increased pressure being created by the partial closing oftbe discharge opening of the supply pipe. It is also to be ob served that the. pump is kept. in operation and at rest during long periods of time. that sc' rib'din'coniicctionlwith'ia singlefp atelier- "a -.vention. -Furthermore,'.}the" location of the lower portion tlltt valve is not? limited to,a pointgneiirjtlfe topof the .tank,': but iti'fiiuiywe-placed-at the 601?, as the waterhead above-the valve in this case determines-the increased statiepressu're in thesupply pipe and the increase over. the static pressure l$ atfected by'the partial closing Ofrtllt! ball valve; i j

-I' realize that various alterations and moditications of this device are possible without departing from the spirit of my invention, and I do not therefore desire to limit myself to the exact form of construction shown and described.

I claimas new and desire to secure by Letters Patent;

1. A self controlled pumping system of the class described, comprising in combination a pump, a water supply pipe leading therefrom, a raised tank into which the supply pipe discharges, a )ressure switch having a comparatively '1 e range of mactivity between its high and low acting points and communicating with said supply pipe and acting to start said pump when water in the tank falls to a predetermined low level and the static pressure in said supply pipe reaches a corresponding low point, and to stop the pump w ten water in the tank reaches u prct ctermincd high level and the pressure in the supply pipe is correspondingly increased above static )lC-SSUIC therein, and means on said supply pipe whereby the pressure in the supply pipe may be increased above static pressure therein.

2. self controlled pumping system of the class described, comprising in combination a pump, a water supply )ipe leading therefrom. a raised tank into which the supply pipe discharges, a pressure switch havmg a comparatively \\'l( 0 range of inactivity between its high aml low act-in" points and communitaiting with said supp y pipe and acting to start said pump when the water in the tank falls to a predetermined low level and the. static pressure in said supply pipe reaches a corresponding low point, and to stop the pump when the water in the tank reaches a predetermined high level and the n'essnrc in the supply pipe is correspondingly increased above static pressure thereicausingam increased pressure -in said supply pipe above the static, pressure therein.

"ji3.*A 'self controlled pumping system of -th'e'ela'ss' described, -comprising in combination a pump, 'a watersupply pipe leading 'eon-mmnicatmg with said supply iini ltih'cttiin'e inganaafvan-e on said supply pip'e'operated b'yjtheriscand fall of water in the tank for therefrom,a"raised"tank into which said sitp'plyfpipe discharges water, a float control ed'valve in the tank and on said sup- -'ply' 1 )ipe -for'closing the passage theretliroi'igh, wherebypressure in said pipe may be increased .above'static pressure therein jupon continued operation of the pump, and

'a"pumpcontrolling pressure switch, having a ctmiparatively wide 'range'of inactivity bet'we'en'its high and low actin points and pipe, said pressure switch being operated by comparativelywide variations of pressure in said supply pipe, said pressure switch acting to start the pump when static pressure in the supply pipe falls to a predetermined point and to stop the pump when the pressure in the supply pipe is increased beyond static pressure therein whenever the water in the tank reaches a high level in the tank.

4. itself controlled pumping system of the class described, comprising in combination a pump, a water supply pipe leading therefrom, a raised tank into which said supply pipe discharges water and from which water discharges at a point near its bottom, a float controlled valve in said tank and on said supply pipe for partiallv closing the passage through said pipe whereby pressure therein may be increased above static pressure therein upon continued operation of the pump, it pump cont-rolling pressure switch harm" a com mratively wide range of inactivity hetwecn its high and low uctinr points and conununicating with said supp v pipe and acting to start said pump when the water in the tank falls to a predetermined low level and static pressure in the supply pipe falls to a corresponding low iointam to stop the pump when the water In the tank reaches a predetermined high level and the )ressnre in the supply pipe is corres iondingiy increased above static pres sure t ierein.

i-\ self controlled pumping system of the class described, comprising in combination a pump, a water snpplv pipe leading therefrom and having a lloat controlled valve on its discharge end. a raised tank into which said supply pipe discharges, a branch pipe opening into said supply pipe and having a check valve. thereon opening toward the supply pipe. said branch pipe serving to discharge water from the tank. and a pressure switch comnumicating with said sup ply pipe and operatively connected with the pump, said pressure switch acting to start the pump when the static pressure in the llu supply pipe fallsto a predetermined low point and to stop the pump when the pressure in said supply pipe increases above the static pressure therein.

6. A self controlled pumping system of the class described, comprising in combination electric water umping mechanism, a water supply pipe eadmg therefrom and having a float controlled valve at its discharge end, a roof tank into which said supply pipe discharges water, said tank having a discharge orifice, a pressure switch having a comparatively wide range of inactivity between its high and low acting points and conununicating with said sup ly pipe and in electrical communication wit-1 said pumping mechanism, said pressure switch acting to start the pumping mechanism whenever the water in the tank falls to a predetermined low level and the static pressure in the supply pipe falls to a corresponding low point and to sto) the pumping mechanism when the water m the tank reaches a predetermined high level and the pressure in said supply pipe is correspondingly increased above the static pressure therein.

In witness whereof, I have hereunto signed my name, at Chicago, Cook county, Illinois, this 23d day of February 1912.

AUGUSTUS C. DUR-DIN, JR.

Copter of this patent may be obtained for five cents each, by addressing the Commtsstoner of Patents. Washington, D. C." 

